Skin treatment handpiece



FIG. 1 is a side view of the skin treatment handpiece;

FIG. 2 is a top view of the skin treatment handpiece;

FIG. 3 is a front view of the skin treatment handpiece; and,

FIG. 4 is a perspective view of the skin treatment handpiece.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a skin treatment handpiece, as shown and described. 